Hello, Bill C!
I use Windows 10 Pro with English Display Language and English Language for non-Unicode programs. I set Latvia is for region and Latvian is format's for numbers, currency, date and time. When I found solution, I did not "dig deeper"
I think - this Decimal symbol problem link also with Welcome dialog page position. Welcome dialog page sometimes going to 0,0 position - randomly. After I change Decimal symbol to dot - it is always in center.